linux-kernel - [PATCH 4.4 25/60] usb: host: ohci-exynos: Decrese node refcount on exynos_ehci_get

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Message-Id: <20170511141238.149739784@linuxfoundation.org>
Date:   Thu, 11 May 2017 16:12:48 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Javier Martinez Canillas <javier@....samsung.com>
Subject: [PATCH 4.4 25/60] usb: host: ohci-exynos: Decrese node refcount on exynos_ehci_get_phy() error paths

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Krzysztof Kozlowski <krzk@...nel.org>

commit 68bd6fc3cfa98ef253e17307ccafd8ef907b5556 upstream.

Returning from for_each_available_child_of_node() loop requires cleaning
up node refcount.  Error paths lacked it so for example in case of
deferred probe, the refcount of phy node was left increased.

Fixes: 6d40500ac9b6 ("usb: ehci/ohci-exynos: Fix of_node_put() for child when getting PHYs")
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/host/ohci-exynos.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -66,10 +66,12 @@ static int exynos_ohci_get_phy(struct de
 		if (IS_ERR(phy)) {
 			ret = PTR_ERR(phy);
 			if (ret == -EPROBE_DEFER) {
+				of_node_put(child);
 				return ret;
 			} else if (ret != -ENOSYS && ret != -ENODEV) {
 				dev_err(dev,
 					"Error retrieving usb2 phy: %d\n", ret);
+				of_node_put(child);
 				return ret;
 			}
 		}